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Method for producing 2-tertiary butyl-p-cresol and 6-tertiary butyl-m-cresol

A technology of tert-butyl and p-cresol, applied in chemical instruments and methods, preparation of organic compounds, organic chemistry, etc., can solve the problems of high cost, high price, high selling price, etc., and achieve the effect of reducing production cost

Inactive Publication Date: 2009-01-28
天津天大天海化工新技术有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Since the difference between the boiling points of p-cresol and m-cresol is less than 3°C, simple rectification cannot be used for separation between them, and other cumbersome methods can only be used, so high-purity p-cresol or m-cresol is expensive. Therefore, the high cost and high price of 4M and 3M have resulted in limiting their application

Method used

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  • Method for producing 2-tertiary butyl-p-cresol and 6-tertiary butyl-m-cresol

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] The mixed cresol that contains 14% (W / W) p-cresol and 16% (W / W) m-cresol enters the rectification column 1 (1), and the group with boiling point before the p- and m-cresol boiling point is distilled out from the top of the tower points, p-, m-cresol and components with boiling point after that are discharged from the bottom of the tower. The temperature at the top of rectification column 1 is 90°C, the temperature at the bottom of the column is 130°C, and the pressure at the top of the column is 0.003MPa.

[0023] The components discharged from the bottom of the rectification tower 1 enter the rectification tower 2 (2), and the p- and m-cresols with a total content of 95.0% (W / W) are distilled from the top of the rectification tower 2, which is the refined mixed cresol, Heavies are discharged from the bottom of the column. The temperature at the top of the rectification tower 2 is 100°C, the temperature at the bottom of the tower is 140°C, and the pressure at the top o...

Embodiment 2

[0029] The mixed cresol that contains 38% (W / W) p-cresol and 26% (W / W) m-cresol enters the rectification column 1 (1), and the group with the boiling point before the p- and m-cresol boiling point is distilled out from the top of the tower points, p-, m-cresol and components with boiling point after that are discharged from the bottom of the tower. The temperature at the top of rectification tower 1 is 195°C, the temperature at the bottom of the tower is 230°C, and the pressure at the top of the tower is normal pressure.

[0030] The components discharged from the bottom of the rectification tower 1 enter the rectification tower 2 (2), and the p- and m-cresols of the total content of 90% (W / W) are distilled from the top of the rectification tower 2, which is the refined mixed cresol, Heavies are discharged from the bottom of the column. The temperature at the top of rectification tower 2 is 205° C., the temperature at the bottom of the tower is 245° C., and the pressure at th...

Embodiment 3

[0036] The mixed cresol that contains 38% (W / W) p-cresol and 26% (W / W) m-cresol enters the rectification column 1 (1), and the group with the boiling point before the p- and m-cresol boiling point is distilled out from the top of the tower points, p-, m-cresol and components with boiling point after that are discharged from the bottom of the tower. The temperature at the top of rectification tower 1 is 195°C, the temperature at the bottom of the tower is 230°C, and the pressure at the top of the tower is normal pressure.

[0037] The components discharged from the bottom of the rectification tower 1 enter the rectification tower 2 (2), and the p- and m-cresols of the total content of 90% (W / W) are distilled from the top of the rectification tower 2, which is the refined mixed cresol, Heavies are discharged from the bottom of the column. The temperature at the top of rectification tower 2 is 205° C., the temperature at the bottom of the tower is 245° C., and the pressure at th...

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Abstract

The invention relates to a method for producing 2-tertiary butyl-paracresol and 6-tertiary butyl-metacresol from mixed cresol, which is characterized in that the mixed cresol is taken as raw material; firstly, the mixed cresol is rectified and separated to obtain refined mixed cresol; then the refined mixed cresol is alkylated to obtain the mixture of 2-tertiary butyl-paracresol and 6-tertiary butyl-metacresol; and the mixture of 2-tertiary butyl-paracresol and 6-tertiary butyl-metacresol is further rectified; as the difference between the boiling point of 2-tertiary butyl-paracresol and the boiling point of 6-tertiary butyl-metacresol is 6 DEG C, the rectification method can be used for separating 2-tertiary butyl-paracresol from 6-tertiary butyl-metacresol to obtain a 2-tertiary butyl-paracresol product and a 6-tertiary butyl-metacresol product with high purity. The method greatly reduces the production cost.

Description

technical field [0001] The invention relates to a method for producing 2-tert-butyl-p-cresol and 6-tert-butyl-m-cresol, especially suitable for producing 2-tert-butyl-p-cresol and 6-tert-butyl by using mixed cresols base-m-cresol. Background technique [0002] 2-tert-butyl-p-cresol (hereinafter referred to as 4M) and 6-tert-butyl-m-cresol (hereinafter referred to as 3M) are important chemical intermediates and are also used as antioxidants. Widely used in chemical additives, plastics, rubber, petroleum products, synthetic materials and other production fields. [0003] In the past, 4M was produced industrially by using p-cresol to react with alkylating agent in the presence of catalyst. Commonly used catalysts include sulfuric acid, ion exchange resin, activated clay, etc., and commonly used alkylating agents include isobutylene, tert-butanol, methyl tert-butyl ether, etc. The method of industrial production of 3M is similar to the production of 4M, the difference is that...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07C39/06C07C37/11C07C37/74
Inventor 刘锋李崇张曾王芳李雪张大治张力擎
Owner 天津天大天海化工新技术有限公司
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